diff --git a/config/SOUE01/splits.txt b/config/SOUE01/splits.txt
index bb76869b..cd67bf1a 100644
--- a/config/SOUE01/splits.txt
+++ b/config/SOUE01/splits.txt
@@ -222,6 +222,9 @@ nw4r/ut/ut_TextWriterBase.cpp:
 	.text       start:0x8042EF20 end:0x80434294
 	.ctors      start:0x804DB950 end:0x804DB954
 
+nw4r/ut/ut_binaryFileFormat.cpp:
+	.text       start:0x8042A9E0 end:0x8042AA54
+
 nw4r/db/db_directPrint.cpp:
 	.text       start:0x804342A0 end:0x80434E9C
 	.rodata     start:0x804F5D28 end:0x804F5FDC
diff --git a/configure.py b/configure.py
index 5336a084..39cc4ffe 100644
--- a/configure.py
+++ b/configure.py
@@ -333,6 +333,7 @@ config.libs = [
             Object(NonMatching, "nw4r/ut/ut_ResFont.cpp"),
             Object(NonMatching, "nw4r/ut/ut_CharWriter.cpp"),
             Object(NonMatching, "nw4r/ut/ut_TextWriterBase.cpp"),
+            Object(Matching, "nw4r/ut/ut_binaryFileFormat.cpp"),
         ],
     ),
     # EGG
diff --git a/include/nw4r/ut/ut_binaryFileFormat.h b/include/nw4r/ut/ut_binaryFileFormat.h
index eeb5faca..8185fc24 100644
--- a/include/nw4r/ut/ut_binaryFileFormat.h
+++ b/include/nw4r/ut/ut_binaryFileFormat.h
@@ -19,8 +19,7 @@ struct BinaryFileHeader {
     u16 numBlocks;  // at 0xE
 };
 
-bool IsValidBinaryFile(const BinaryFileHeader* header, u32 magic, u16 version,
-                       u16 numBlocks);
+bool IsValidBinaryFile(const BinaryFileHeader *header, unsigned long magic, u16 version, u16 numBlocks);
 
 } // namespace ut
 } // namespace nw4r
diff --git a/src/nw4r/ut/ut_binaryFileFormat.cpp b/src/nw4r/ut/ut_binaryFileFormat.cpp
new file mode 100644
index 00000000..1b62b51c
--- /dev/null
+++ b/src/nw4r/ut/ut_binaryFileFormat.cpp
@@ -0,0 +1,28 @@
+#include <nw4r/ut/ut_binaryFileFormat.h>
+
+namespace nw4r {
+namespace ut {
+
+/* 8042a9e0 */
+bool IsValidBinaryFile(const BinaryFileHeader *header, unsigned long magic, u16 version, u16 numBlocks) {
+    if (header->magic != magic) {
+        return false;
+    }
+    if (header->byteOrder != 0xFEFF) {
+        return false;
+    }
+    if (header->version != version) {
+        return false;
+    }
+    if (header->fileSize < (numBlocks * sizeof(BinaryBlockHeader) + sizeof(BinaryFileHeader))) {
+        return false;
+    }
+
+    if (header->numBlocks < numBlocks) {
+        return false;
+    }
+    return true;
+}
+
+} // namespace ut
+} // namespace nw4r